Výsledky vyhledávání - "Hyeongmun Kim"

Akademický článek

Ionizing terahertz waves with 260 MV/cm from scalable optical rectification

Autor: Hyeongmun Kim, Chul Kang, Dogeun Jang, Yulan Roh, Sang Hwa Lee, Joong Wook Lee, Jae Hee Sung, Seong Ku Lee, Ki-Yong Kim

Publikováno v: Light: Science & Applications, Vol 13, Iss 1, Pp 1-13 (2024)

Abstract Terahertz (THz) waves, known as non-ionizing radiation owing to their low photon energies, can actually ionize atoms and molecules when a sufficiently large number of THz photons are concentrated in time and space. Here, we demonstrate the g

Externí odkaz: https://doaj.org/article/71a8dd17d3134c638b815357d53759b5

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Akademický článek

Multi-millijoule terahertz emission from laser-wakefield-accelerated electrons

Autor: Taegyu Pak, Mohammad Rezaei-Pandari, Sang Beom Kim, Geonwoo Lee, Dae Hee Wi, Calin Ioan Hojbota, Mohammad Mirzaie, Hyeongmun Kim, Jae Hee Sung, Seong Ku Lee, Chul Kang, Ki-Yong Kim

Publikováno v: Light: Science & Applications, Vol 12, Iss 1, Pp 1-11 (2023)

The electrons, accelerated by the laser ponderomotive force and subsequent plasma wakefields, radiate broadband emission continuously along the laser propagation direction, resulting in multi-mJ THz radiation in the far field.

Externí odkaz: https://doaj.org/article/facf31a2fb2049e983fd6e51d0c281c3

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Akademický článek

Terahertz Optical Properties and Carrier Behaviors of Graphene Oxide Quantum Dot and Reduced Graphene Oxide Quantum Dot via Terahertz Time-Domain Spectroscopy

Autor: Seunghyun Song, Hyeongmun Kim, Chul Kang, Joonho Bae

Publikováno v: Nanomaterials, Vol 13, Iss 13, p 1948 (2023)

Graphene quantum dots (GQDs) with a band gap have been widely applied in many fields owing to their unique optical properties. To better utilize the optical advantages of GQDs, it is important to understand their optical characteristics. Our study de

Externí odkaz: https://doaj.org/article/387f0ea1522243f9927a5d7333e8a174

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Akademický článek

Topological Surface‐Dominated Spintronic THz Emission in Topologically Nontrivial Bi1−xSbx Films

Autor: Hanbum Park, Seungwon Rho, Jonghoon Kim, Hyeongmun Kim, Dajung Kim, Chul Kang, Mann‐Ho Cho

Publikováno v: Advanced Science, Vol 9, Iss 21, Pp n/a-n/a (2022)

Abstract Topological materials have significant potential for spintronic applications owing to their superior spin–charge interconversion. Here, the spin‐to‐charge conversion (SCC) characteristics of epitaxial Bi1−xSbx films is investigated a

Externí odkaz: https://doaj.org/article/95e21ffdfa2d466b81c44a2b172a1a7e

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